[NH2:1][C:2]1[C:11]([N+:12]([O-:14])=[O:13])=[CH:10][C:9]2[C:4](=[CH:5][C:6]([S:15][CH2:16][CH:17]([CH3:19])[CH3:18])=[CH:7][CH:8]=2)[CH:3]=1.ClC1C=CC=C(C(OO)=[O:28])C=1>C(Cl)(Cl)Cl>[NH2:1][C:2]1[C:11]([N+:12]([O-:14])=[O:13])=[CH:10][C:9]2[C:4](=[CH:5][C:6]([S:15]([CH2:16][CH:17]([CH3:19])[CH3:18])=[O:28])=[CH:7][CH:8]=2)[CH:3]=1To 0.1 mol of 2-amino-7-isobutylthio-3-nitronaphthalene, prepared in Example 5, stirring in 200 ml of chloroform at 4°-6° (ice bath), is added 0.1 mol of m-chloroperbenzoic acid in 160 ml of chloroform over 3 hours. Consumption of starting material is confirmed by TLC (silica gel, ether). The reaction mixture is washed 3 times with saturated NaHCO3 solution, dried (Na2SO4), and filtered. The filtrate is evaporated to dryness under vacuum and the residue recrystallized from ethanol (absolute) to yield the title compound.
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